<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Document</title>
    <style>
        .x {
            width: 200px;
            height: 200px;
            background-color: black;
            text-align: center;
            border-radius: 50%;
            line-height: 200px;
            margin: 200px auto;
            transform: rotate(45deg);
            transition: all 20s;
            transform-origin: right bottom
        }
        
        .y:hover .x {
            transform: rotate(99999999deg);
        }
    </style>
</head>

<body>
    <div class="y">
        <div class="x"></div>
        <div class="x"></div>
    </div>
</body>

</html>